Today's Message Index:
----------------------
1. 10:03 AM - "Contactor Questions" , battery in the trunk, now Ground power plug (Bob Verwey)
2. 11:03 AM - Re: "Contactor Questions" , battery in the trunk, now Ground power plug (Robert L. Nuckolls, III)
3. 03:01 PM - Re: "Contactor Questions" , battery in the trunk, now Ground power plug (John B)
4. 03:19 PM - Re: "Contactor Questions" , battery in the trunk, now Ground power plug (Werner Schneider)
5. 03:40 PM - How many connections are too many (AdventureD)
6. 04:25 PM - Re: How many connections are too many (user9253)
7. 05:09 PM - Re: How many connections are too many (Charlie England)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | "Contactor Questions" , battery in the trunk, now Ground |
power plug
Thanks for the responses to my query....I now have the right solution.
Any recommendations as to how to tie this receptacle into the schematic?
[image: image.png]
More specifically the polarity relay that is indicated.
Best Regards,
Bob Verwey
082 331 2727
On Sun, 23 May 2021 at 19:20, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 11:57 PM 5/19/2021, you wrote:
>
> This is kinda related to contactors...
>
> On the BD4 that I am rebuilding, the battery is behind the baggage
> compartment, with a really fat wire running up to the firewall.=C3=82
>
> IO 470 engine so lots of amps required for start.
>
> Is there a recommended contactor placement/battery disconnect=C3=82 proto
col
> out there?
> I'm thinking safety in the event of an incident which might short out the
> fat wire to the fuselage.
>
>
> Battery contactor located as close as practical
> to battery; starter contactor as close as practical
> to starter. FAT wire connects battery contactor
> to starter contactor and main bus feeder.
>
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
>
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: "Contactor Questions" , battery in the trunk, |
now Ground power plug
At 12:02 PM 5/24/2021, you wrote:
>Thanks for the responses to my query....I now have the right solution.
>Any recommendations as to how to tie this receptacle into the schematic?
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z31K.pdf
Your schematic didn't come thru to me. The
link above is to a recommended methodology
for installing this style ground power
connector.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: "Contactor Questions" , battery in the trunk, |
now Ground power plug
Is this external power receptacle on a Western airplane? Or a Yak/CJ?
On Mon, May 24, 2021 at 12:27 PM Bob Verwey <bob.verwey@gmail.com> wrote:
> Thanks for the responses to my query....I now have the right solution.
> Any recommendations as to how to tie this receptacle into the schematic?
>
> [image: image.png]
>
> More specifically the polarity relay that is indicated.
>
> Best Regards,
> Bob Verwey
> 082 331 2727
>
>
> On Sun, 23 May 2021 at 19:20, Robert L. Nuckolls, III <
> nuckolls.bob@aeroelectric.com> wrote:
>
>> At 11:57 PM 5/19/2021, you wrote:
>>
>> This is kinda related to contactors...
>>
>> On the BD4 that I am rebuilding, the battery is behind the baggage
>> compartment, with a really fat wire running up to the firewall.=C3=82
>>
>> IO 470 engine so lots of amps required for start.
>>
>> Is there a recommended contactor placement/battery disconnect=C3=82 prot
ocol
>> out there?
>> I'm thinking safety in the event of an incident which might short out th
e
>> fat wire to the fuselage.
>>
>>
>> Battery contactor located as close as practical
>> to battery; starter contactor as close as practical
>> to starter. FAT wire connects battery contactor
>> to starter contactor and main bus feeder.
>>
>>
>>
>> Bob . . .
>>
>> Un impeachable logic: George Carlin asked, "If black boxes
>> survive crashes, why don't they make the whole airplane
>> out of that stuff?"
>>
>
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: "Contactor Questions" , battery in the trunk, |
now Ground power plug
standard Cessna power receptacle
https://www.aircraftspruce.com/catalog/elpages/extpowerrect.php
<https://www.aircraftspruce.com/catalog/elpages/extpowerrect.php>
On 24.05.2021 23:59, John B wrote:
> Is this external power receptacle on a Western airplane? Or a Yak/CJ?
>
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | How many connections are too many |
I am reconfiguring some wiring to make it more user friendly next time I have to
dig into it, and a question arises about the trade off between ease of use and
connection quality. The main question is where to draw the line in the number
of connections allowed to make things easy.
For example, my bus (with breakers) on the back of the panel has all wires running
to wires to a canon plug to allow disconnecting the canon plug and pulling
out the breaker panel. The radio harness connects multiple avionics together
but also has power, ground, headset, and lighting wires going to other places.
Can I have additional connectors (e.g., Deutsch or canon connectors) making
those connections to the harness so that it is easy to pull the harness if I
have to? That would mean that each radio power wire has two connections beyond
the bus, one just away from the bus, and one nearer the radio (not to mentions
the connection to the bus and the dsub connected to the radio. Too many?
How many is too many?
Same question for grounding. My ground bus on the back of the firewall is in a
location that is hard to reach when the panel is installed. Could I have grounds
on the cockpit side of the firewall going through a canon plug to allow easy
removal of the panel without unplugging each and every ground faston? Too
many connections?
I realize there is a technical way to see how much you lose from each connection.
Are the rules of thumb on the number of connections for different types of
circuits that are consistent with accepted practice?
What is the best thing to read on this.
Thanks in advance.
Happy and safe flying,
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502047#502047
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: How many connections are too many |
You can have as many connections as you want. But keep in mind that the
vast majority of electrical problems are due to bad connections. Base your
decision on how often wires must be taken apart.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502048#502048
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: How many connections are too many |
On 5/24/2021 5:38 PM, AdventureD wrote:
>
> I am reconfiguring some wiring to make it more user friendly next time I have
to dig into it, and a question arises about the trade off between ease of use
and connection quality. The main question is where to draw the line in the number
of connections allowed to make things easy.
>
> For example, my bus (with breakers) on the back of the panel has all wires running
to wires to a canon plug to allow disconnecting the canon plug and pulling
out the breaker panel. The radio harness connects multiple avionics together
but also has power, ground, headset, and lighting wires going to other places.
Can I have additional connectors (e.g., Deutsch or canon connectors) making
those connections to the harness so that it is easy to pull the harness if
I have to? That would mean that each radio power wire has two connections beyond
the bus, one just away from the bus, and one nearer the radio (not to mentions
the connection to the bus and the dsub connected to the radio. Too many?
How many is too many?
>
> Same question for grounding. My ground bus on the back of the firewall is in
a location that is hard to reach when the panel is installed. Could I have grounds
on the cockpit side of the firewall going through a canon plug to allow
easy removal of the panel without unplugging each and every ground faston? Too
many connections?
>
> I realize there is a technical way to see how much you lose from each connection.
Are the rules of thumb on the number of connections for different types
of circuits that are consistent with accepted practice?
>
> What is the best thing to read on this.
>
> Thanks in advance.
>
> Happy and safe flying,
> Dan
One option (easiest if you plan for it before executing the build) is to
put all the power handling switches/CBs on a panel that can stay with
the airframe when the panel comes out. Basically bundle all the wires
going to/from the switch or CB panel, and either bottom mount the panel
to the main panel or rear mount it in the main panel. To remove the main
panel, just remove the screws holding the power panel(s) and let them
'dangle' when you remove the main panel. If you need a pic, I'll try to
take one for you tomorrow.
Charlie
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|